Bit-forming machine



"Jan 6, 1931.

N. D. LEVIN I'IAL BIT Folimme MACHINE Filed April 30, 1925 :s sham-sum 1Jan 6, 1931. N. n. LEVIN ETAL BIT FORMING MACHINE Filed April 30, 1926 3Sheets-Sheet 2 .i I I N. D. LEVIN ETA]. 1,787,827

BIT FORMING MACHINE Filedapriil 30. 1926 3 Sheets-Sheet 3 0 \N I a m k mJan 6; 1931.

Patented Jan. 6, 1931 I UiN r srA Es v NILs n. LEVIN Ann nnns'r rnononMULLER,.OF ooLU B s, OHIO, ASSIGNORS r THE OF COLUMBUS, 01110, ACORPORATION or hand upbn an anvil lack the uniformity of shape and sizeessential tothe' economical we are familiar, possess certain inherentde} 1 JEFFREY MANUFACTURING ooMrAnY',

onro PATENT; oFF cE BIT-FORMING MA cniNn "Application filed Apri130,1926. Seria1 No.105;843. v

- Thepresentinvention relates to certain new and useful improvements nbit forming machines, and particularly 1 to machines adapted to formcutter bits suitable for use inthe cutter chains ofcoalmining machines,and similar objects. a

In the method of mining coal which is commonly practiced at the presenttime kerfs', or grooves, are formed in the face'of the vein to afiord acleara-nce into which the coal may be moved by blasting, or othersuitable means, to break up and dislodge 1t.

These kerfs are commonly cutby tools, known as cutter bits, attached toan endless chain adapted to travelin guideways upon the cutter arm ofthe mining machine. In

such'service the points of the bits soon wear off and become dull, andthe dull bits must be replaced bysharp ones. tates, the reshaping andsharpening of large number of cutter bits, and each mine is usuallyprovided with a smithy where such work is performed. Cutter bits formedby operation of a mining machine.- The satisfactorily operable machinesheretofore available for the production of cutter bits have beenponderous affairs only suitable for use in large manufacturingestablishments and entailing very considerable initial investment.Numerous attempts have been made to produce relatively small andinexpensive machines adapted to use in the blacksmith;

shops associated with coal mines. All such machines heretoforeconstructed, with which fects which itis the object of thisinvention toovercome. Y Y

It is the especial object of this invention to provide an eflicientdurable and inexpensive machine, suitable for use in the blacksmith shopassociated with the coal mine, whereby accurately formed bits may beconviently and economically made from new This necessirolled bar'stock,andfbit's'worn in service may be reformed and renewed. U

The means whereby we attain this object are fully set forth in thefollowing specification, and illustrated, in the accompanying I drawingsof whioh Fig. 1,'is a side elevation ofthe preferred embodiment of ourinvention. 7 V Fig.2, is anend elevation. I 1 V Fig. 3, 1 is a planpviewof the machine shown in Fig. 1. f 1:

Fig. 4,- is a sectional vie'w'taken along line IV.IV of Fig. 2.

i Fig. 5,1is asectional View taken along the line of of 1, showing thedie in operative relation with the roll..

Fig. 6, is a fragmentary sectional view taken along the line VIVI ofFig. 4.

Fig. 7, is a fragmentary sectional view.

taken along'the line'VII-VII of Fig. 3.

, Fig. 8, is a-diagrammatic perspective view.

of the bit marking mechanism.

.Fig. 9, is a fragmentary sectional view showing the ejecting mechanism.

Fig. 10 is a perspective detail of the die upon which the bits areformed;

Like numerals refer to similar parts in the several figures.

In the drawings the numeral 1 refersto the main frame of the machine.Journaled in bearings 2 of the main frame 1 is a transversely extendingshaft 3 to the projecting end of'whieh is fixed a spur gear 4:. The gear4 meshes with a pinion 5 which is rotatable upon a stud shaft 6projecting from the frame 1. Fixed to the pinion 5 is a fly. wheelpulley 7 adapted to be. connected by a suitable endless belt, not shownin the drawing, with a convenient source of rotative power to causecontinuous revolution of the shaft 3. Fixed vto the shaft 3 between thejournal bearings 2, is a bit forming roll -8 in the peripheryof which isformed a circumferential groove 9 the contour of which corresponds tothe form of the back of the cut the hand of the operator; Formed ontheshaft 11 between the bearings 10, isa cylindricalenlargement 13 whichis eccentric of the bearin 's 10, and upon the cylinder leis journaled ahub 14. Projecting upwardly from the hub 14 is a radial arm 15 to theouter end of which is fixed the-anviljl6 which is' of circular curvatureconcentric with the cylinder 13. These parts are of such proportionsthat rotation ofthe-shaft $11 will cause the eccentric 13 to lift the.anvil 16 into forced engagementwith, the con-;

stantly revolving forming roll- 8, the frictiona-l efi'ort of- 'whichtends to drive the anvil 16 forwardly about its axis 13. A spring'17connected atone endjtothe main frame 1 and at the other end to the arm18 formed on the hub 14, tends to rotate the anvil 16 rearwardly and toretainit in its idle position in Contact withqthe stop .19 when thefrictional cont-act lwith the roll 8 is-r'eleased; A resilient stop .20fixed to thefrain'e 1 is adapted to'engage the forward end of the anvil16 to limit its movement; H

Fixed in a suitable recess of the anvil 16 is the die 21 which consistsof a steel plate the upper edge 22 of which projects above the surfaceof the anvil and is shaped to conform to the contour of the groove 9 inthe roll 8 with which it registers. The forward end of the plate 21 isshaped at 23 to form the face of a cutter bit in a. manner which willhereinafter appear. The face 23 of the die 21 is transversely corrugatedas shown in Figs. 7 and 10, to reduce the tendency of the metal to slipupon the die during the formingoperation. Immediately infront of the'die plate 21 is'a socket 24 adapted to receive I and hold in place thebit steel 25 during the operation of forming. When a suitably to squeezethe metal against the die block.

and form the cutting'head of the bit. Aplunger26 slidably'mounted in thesock:

set 24, engages the lower end of the bit steel 25 to hold it in place,and awedge 27 a'r-' rangedito engage the lower end oft-he plung- @1 26serves to limit its downward movement. Fixed t o the wedge 27 is arearward extending rod 28 upon which is formed a screw thread engaged bya knurled head 29 mounted in the anvil casting and securedagainstlongitudinal movement relative thereto.

- The knurled head-29 is positioned convenient that position. v v shaft'45, and to this arm 1S fixed a roller 49 adapted to engage the anvil 16as it moves to the hand of the operator, and by its rotation the wedge27 may be moved forward and backward to adjust the position of theplunger longitudinal of the socket 24, thereby adapting the machine tothe formation of bits of different lengths.

' A- bell crank 30,pivotally mounted upon a stud 31 fixed to the machineframe 1, isprovided with a downwardly projecting arm 32 and a horizontalprojecting arm 33, and is normally maintained in its idle position by astop 34 formed on the machine frame 1 which engages the rearward face ofthe downwardly projecting arm 32. A pin 35 projecting laterally from theanvil casting, is adapted to engage the arm 32 of the bell crank whenthe anvil approaches. the forward limit of its movement, causing thehorizontally projecting arm 33 to move upwardly into contact with thefinger 36 of the plunger 26, to liftsaid plunger and thereby eject thcbit steel 25 from the socket. As the bit 25 moves upwardly it is engagedby a spring 37 and forced laterally into the chute 38 by which the bitsareconducted'a-Way from the machine; j I

' Iii ord-er that tl1e:bitsniay be accurately positioned in theminingmachine chain, we

have provided means forcutting a nick in the bit shank at the depth towhich it should extend into the socket of the cutter chain. This nickingdevice consists of a tool 39 attached to a. vertical shaft 40"journaledin a bearing 41' of the machine frame. These parts are so proportionedand positioned that when the nicking tool 39' stands in one position ofits angular adj ustment'aboutthe axis of the shaft 40 it will engage theco'rner of the bit st'eel25 to cut a. notch therein. Fixed to the shaft40 is a crank arm 42 connected by a rod 43 with a siinilar crank arm 44fixed to a horizontally disposed shaft 45. A tension spring 46',attached at one end to the machine frame and at the other end toa secondarm 47which is also fixed to the shaft 45, tends to rotate the nickingtool 39to its operative position, and to resiliently hold it in Anarm 48is fixed to the forwardly, and through the connections above described,to rotate the nicking tool 39 into its idte position at one side of thepath of'the' cutter bits 25. These parts are so proportioned andarranged that, ass'oon as the iiickinp; tool 39 has nicked the corner ofthe bit, saidtoolwill beinoved aside, out of the path of bit25, toprevent further interference with its movements. I When new bits areformed from rolled bar stock it is desirable that the end of the steelbe'sdn'rewhat memento facilitate forming underfthe roll For th s purposewe have provided asqueezing device comprising eccentric 50-, formed onthe projecting end of the shaft 4, and fittedwith an eccentric rod 51."To the lower endof the eccentric rod 51 is fixed'a die block 52 adaptedto cooperate suitable for working. As each piece is taken from theheating furnace its end is inserted between-the dies 52 and to bepointed preliminary'to the final rolling operation. The bli steel 25 isthen inserted, with its pointed end upward in the sockets 24 of theanvil. The knurled head 29 may'then be manipulated to cause the properamount of. steel to project from the socket Qel. By movement of the.

lever l2the anvil iselevated into contact with the roll 8 and drivenforward thereby carry-- ing the bit steel beneath the roll Shy which itsmetal is squeezed against the face of the die accurately forming thecutting head of the bit; As the bit is carried beyond the roll 8, thenicking tool-39 placesa nick" in its side to indicate the depth to whichit should be'inserted in the socket of the min-' ing' machine chain,after which the'ejecting mechanism discharges the finished bit fromthefsocket 24 onto the chute 38 in the manner above described.

In the mechanism above described we have" PlOVlQlGQlEL relatively-smalland inexpensive;

machine, convenient and economical ofoperati'on, whereby cutter bitsmay-i beaccurately and expeditiously formed, andby which hits worn inservice be sharpened and renewed.

W hat we claim is 1. In a'bit forming machine, the combination with apower driven continuously revolving roll having a continuous peripheralforming face, of an anvil mounted adjacent said roll and having asurfaceadapted to frictional engagement therewith whereby said anvil may becaused to move relative to said roll, and adie carried by said anvil tothe rear of its initial point of engagement with safe roll adapted tocooperate with said roll at all peripheral points thereof to form acutting head upon a suitably disposed bit steel as and for the purposeset forth.

2. 111 a bit forming machine, the combination with a supporting frame,of a continuously revolving roll mounted in fixed position upon saidframe, a. shaft'spacedfrom and extending parallel to the of said rolland ournaled 1n bearings of said framepa ylindrical enlargement formedon said shaft eccentric to said journaled bearings, an anvil pivotallymounted upon said cylindrical enlargement and having an arouate surfaceconcentric therewith, means to rotate said shaftto cause said eccentricto move said arcuate surface into frictional engagement Wllill SL1Clsteel roll to cause rotary movement. of said anvil aboutsaidi'cylindrical enlargement, stops 'arranged upon the frame to limitr'otarymove ment of said anvil: in eitherdirection, and

meansto move saidanviiwrearwardly upon the interruption of" saidfrictional engagement as and for-thepurpose set forth.

.3. Inabit forming. machine, the combination with acsupporting frame, ofa continuously revolving rollmounted in fixed-position upon said frame,a shaft spacedfrom and extendingparallel to the aXis'of said roll andjournaled inbearings of saidframe, a cylindrical enlargementformed onsaid shaft ec centric to said journal bearings, an anvil pivotallymounted uponsaid cylindrical enlargement andhavingan arcuate surfaceconcentric therewith, means to rotate said shaftto.

causesaid eccentric to move said arcuate surfacesinto frictionalengagement with said roll to causerotary movement of said anvil aboutSEtlClCYllIldTlCLl enlargement, and a springv to rotate said anvilrearwardly upon, the inter-,

ruptionof said frictional engagement as and forthepurpose set forth.- 11 Aeln a bit forming machine,--the combination with a supporting frame,of a continuously revolving roll mounted in fixed p0sition'uponsaidx'frame, a shaft spacedfrom and extending parallel to the axisofsaid'roll and journaledlin bearings of said frame, a cylindricalenlargement formed on said shaft eccentric to said journal bearings,ancanvil pivotally mounted upon said cylindrical enlargement and havingan arcuate surface .concentric therewith, and means to rotate saidshaftto cause said eccentric to move said arcuate surface'intoifrictional engagement with said roll as andfor'the purpose setforth.

5. In a bit forming machine, the combination with a supporting frame, ofa continuously revolvingiroll mounted in fixed position upon said frame,a shaft spaced from and extending parallel to the axis of said roll andjournaled in bearings of said frame, a cylindrical enlargement formedonsaid shafteccentricto said journal bearings, an'anvil pivotally'mounted upon said cylindrical enlargement and having an arcnate surfaceconcentric therewith, means to rotate said shaft to cause said[eccentric to' move said arcuate surfaceinto frictional engagement withsaid roll to cause rotary movement of saidwanvil about" saidcylindricalenlargement, anda stop arranged to limit forward movement of said anvilas and for the purpose set forth.; v

6. In a-machine of the class described,the

combination with a revolving roll adapted to form one side of a cuttinghead,.of a die plate having a surface adapted to form theother .side ofthe cutting head, means to hold a bit steelin suitable relation withsaid dieiand roll during the forming operation, and means upon the:forming surface ofsaid die to pre- V vent the slippage of'tlie metal ofthe bit steel during the forming operation as andfor the purpose setforth.

7 In a machine of the class described, the

coinbination with'a revolving roll adaptedto form one side of a cuttinghead, of'a die plate having a surface adapted-to form the other sideofthe cutting head, means to hold a bit steel in suitable" relation withsaid die and roll during the forming operation, and transverselvextending grooves in the forming surface (if the die adapted toprevent-slippage 7 of the metal :of the bit steelduring the form .fortht8. In a machine of theclass described, the

ing Operation as and combination With means to move a bit steel along apredetermined path, ofmeans efiec-J tive to form a cutting head uponsaid bit steel asit travels along said path,and other means move saidnicking toolout of said path after thenicking. operation as and for thepurpose set forth.

I 10. In a machine of-the classdescribed, the

combination with means to move a bit steel along a'fipredetermined path,of means effective to forma' cutting head upon said bit steel as ittravels alongsaid path, a nicking tool resiliently heldin positioninsaid path adapted toen gage said bit steel to nick it, and means "tomove said nicking tool out of said path after the nicking operation asand for the purpose set forth. 7

11. In a machine of the class described, the combination with means tomove a bit steel along a predetermined path, of means effective to forma cutting head upon said bit steel as it travels along said path, ashaft rotatably' mounted adjacent said path, a nicking tool carried bysaid shaft and adapted in one position of rotary adjustment to ex,

tend into said. path to engage said bit steel to nick it, and means torotate said nicking tool about its axis of said shaft after the forth. 1r

j 12. In a machine of the class described, the combination With meansto-move a bit steel along a predetermined path, of means effective toform a cutting head upon said bit' as it travels along said. path, ashaft rotatably mounted adjacent said path,a nicking tool carried bysaid shaft adapted in one position of'ro ta'ry adjustment to extend intosaid path m engage said bitsteelto nickit,and

for the purpose set niclting operation as and forthe purpose setautomatically acting means to rotate said nicking tool out of said pathafter the nicking operation as and for the-purpose set forth.-

I 13; In a machine of the class described, the combination With a bitforming device, of

abit holding device adapted to move a bit steel relative to said formingdevice during the forming operation, of a ni'cking tool in the path ofsaid bit steel adapted to nick it, and means actuated by said bitholding device to move said nickingtool out of the path of said bitsteel after the nicking operation as and for the purpose set forth.

1 14. In a machine of the class described, the

combination'with a bit forming device, of a bit holding device adaptedtomove a bit steel relativeto said forming device during the formingoperation, of a shaft rotatably mounted adjacent the path of said bitsteel, a nicking tool carried by said shaft and adapted to extend intothe path of said bit steel to nick it, and means actuated bysaid holdingdevice adapted to move said nicking tool out of the path of said bitsteel after the nicking operation as and for the purpose set forth.

'a nicking tool carried by said shaft adapted toeXtend into the pathof'said bit steel to nick-it, and a lever adapted .to beengaged i.

by'said bit holding device to rotate said nicking tool about the axis ofsaid shaft as and for the purpose set forth.

16. In a machine of the class described, the combination With a bitforming device, of a bit holding device adapted to move a bit steelrelative to said bit forming device during the forming operation, meansto eject said bit steel from said holding device after the formingoperation, and resilient means to deflect said bit steel laterally ofsaid holding device When ejected as and for the purpose set forth. p

17 In a machine of the class described, the combination with a bitforming device, of a bit holding device adapted to'move a bit steelrelative to said forming'device during the forming operation, means toeject the said bit steel from said holding device after said formingoperation, and a-spring adapted to engage saidbit steel as it is beingejected from said holding device to deflect it laterally thereof as andfor the purpose set forth.

18. In a machine of the class described, the combination With a' bitforming device, a

holding device adapted to move a bit steel relative to saidformingdevice during the forming operation, means to adjust the bit steelrelative to the holding device, and automatically acting devicesadaptedtoejectsaid cable member having an upwardly open socket for receiving ablank, an abutment in the socket, an arm pivoted to a fixed element adjacent the member, means for automatically rocking said armduring themovement of said member, said arm being adapted in its rocking-to engagethe abutment for displacing the latter whereby the bit is ejected fromthe socket.

I 21. In a bitforming machine, a driven shaft, a'rotating die thereon,said die having a continuous forming face, a die operatively movablerelative to said rotating die, an armate support for said movable die,said support being pivoted at its arc center, and means for radiallydisplacing said arcuate support into engagement with said rotating dieto initiate movement of the support and its associated.

die.

22. In a machine of the class described, a power drive, a bit holdingdevice, means operated by the power drive to eject a bit upwardly fromsaid holding device, and means to deflect the ejected bit laterally ofsaid holding device.

23. In a machine of the'class described, the

adapted for frictional engagement therewith,

whereby said anvil may be caused to move relative to the rollabout itsa-Xis,'and a die carried by said anvil to the rear of its initial pointof engagement with said roll adapted to cooperatewith said roll at allperipheral points thereof to form a cutting head upon a suitablydisposed bit steel. In testimony whereof we set our hands.

"NILS'D. LEVIN. E. FEODOR MULLER.

have hereunto combination with a bit forming device, of a holding devicefor a bit steel, means to move one of said devices relative to the otherto form the bit, and means automatically actuated by the moving devicesubsequent to the forming operationto eject the bit, said meansincluding a lever mounted on said other device and tripped by the movingdevice. r

24. In a machine of' the class described,

the combination with a bit forming device, of a holding device for a bitsteel, said hold ing device including an upwardly open" socket toreceive the bit steel and a movable abutment forming the bottom of thesocket, means to reciprocate one of said devices relative to the otherto form the bit, and means automatically actuated by the reciprocatingdevice subsequent to the forming operation to move the abutment'to ejectthe bit'upwardly, said means including a lever tripped by the movindevice.

25. tion with a power driven continuously revolving roll havinga'continuous peripheral forming face, of an anvil pivotally mountedadjacent said roll and having an -arcuate surface, concentric with itspivotal support In a bit forming machine, thecombina-

